Change from ::stdout to stderr when reporting fatal error.
Change from ::stdout to stderr when reporting fatal error.

The pnacl linux x86_64 buildbot doesn't understand ::stdout (it uses
a macro to define stdout). Fix by removing :: prefix. Also redirects
the error messages to stderr instead of stdout.

BUG=None
R=stichnot@chromium.org

Review URL: https://codereview.chromium.org/1383053002 .

bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader,google/swiftshader